<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <select v-model="likeCity">
            <option value="三亚">三亚</option></option></option></option>
            <option value="西藏">西藏</option>
            <option value="内蒙">内蒙</option>
            <option value="新加坡">新加坡</option>
        </select>
        <hr/>
        <select v-model="likeCity1" multiple> <!-- multiple 设置下拉框多选 -->
            <option value="三亚">三亚</option></option></option></option>
            <option value="西藏">西藏</option>
            <option value="内蒙">内蒙</option>
            <option value="新加坡">新加坡</option>
        </select>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    likeCity: '三亚',
                    likeCity1: []
                }
            }
        })
</script>
</body>

</html>